在C ++中将字符串拆分为多个变量 [英] Splitting a string into multiple variables in C++

问题描述

我在写一个程序，从用户读取一个字符串，并使用它来处理请求。发出提示后，我可以通过以下形式的三种回复中的一种：

I'm writing a program that reads a string from the user and uses it to process a request. After issuing a prompt, I can expect one of three possible responses in the form of either:

1. 字符串


2. 字符串整数


3. 字符串

根据用户给出的命令类型，程序是做不同的任务。我有一个困难的时间试图处理用户输入。要清楚，用户将键入命令作为单个字符串，因此，用户行使选项二的示例可能在提示后输入age 8。在这个例子中，我希望程序将age存储为字符串，将8作为整数存储。

Depending on which type of command the user gives, the program is to do a different task. I'm having a difficult time trying to process the users input. To be clear, the user will type the command as a single string, so an example of a user exercising option two might input "age 8" after the prompt. In this example I would like the program to store "age" as a string and '8' as an integer. What would be a good way of going about this?

根据我在这里收集到的内容，使用strtok（）或boost可能是一个解决方案。我试过两个没有成功，但它将是非常有益的，如果有人可以帮助使事情更清楚。提前感谢

From what I've gathered on here, using strtok() or boost might be a solution. I've tried both without success however and it would be very helpful if someone could help make things clearer. Thanks in advance

推荐答案

获得一行输入 std :: getline ，您可以使用 std :: istringstream 来循环文本以进一步处理。

After getting one line of input with std::getline, you can use a std::istringstream to recycle the text for further processing.

// get exactly one line of input
std::string input_line;
getline( std::cin, input_line );

// go back and see what input was
std::istringstream parse_input( input_line );

std::string op_token;
parse_input >> op_token;

if ( op_token == "age" ) {
    // conditionally extract and handle the individual pieces
    int age;
    parse_input >> age;
}

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